#include <stdio.h> 


int main()
{

	int  i = 0;
	char  a[] = "cbm";
	char  b[] = "cqid", c[10];

	while (a[i] != '\0' && b[i] !='\0')
	{
		if (a[i] >= b[i]) c[i] = a[i] - 32;
		else
			c[i] = b[i] - 32;
		++i;
	}
	c[i] = '\0';
	puts(c);

	return 0;
}